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SELECTING A POWER SUPPLY
When you operate the inverter for long periods of time combined with a high continuous load
demand, the result will be a large power drain from the battery. With this in mind, check the
reserve capacity of the battery you plan to use to power your inverter. To calculate the approxi-
mate power drain on your battery you will want to estimate the reserve power (amp/hour) of
the battery and the amps the inverter will require, to meet the continuous load demand of the
appliance.
1. When calculating the amp/hour of the battery, find its reserve minutes rating. This is typically
is marked on the battery label along with the Cold Cranking Amps (CCA) rating. If you multiply
the reserve minutes rating of the battery by 0.3 it will tell you the battery amp/hour.
2. To estimate the maximum battery power the inverter will require to run a piece of equipment
or appliance, divide its continuous load wattage equipment by 10.
3. Conclusion: The reserve power of a battery with a 150 reserve minutes rating is sufficient to
satisfy the continuous load demand placed on the inverter for a maximum of about one hour.
(45 amps/hour-amp draw = 1 hour).
NOTE
The type of battery you use to power your inverter is important. Batteries designed to start
engines have multiple layers of very thin plates. These provide extensive surface area that will
produce a powerful short burst of electrical power required to start combustion engines. Using
an inverter will cause a battery to discharge and recharge often.
We recommend that you use a different type of battery that is designed specifically for this type
of load requirement. Deep cycle (marine) batteries generally have the highest reserve ratings.
They are designed with thicker plates making them capable of withstanding repeated complete
drains of power and recharging. If you do not have a deep cycle battery we recommend that you
run the engine of your vehicle when operating the inverter.
•
When the inverter will be operating appliances with high continuous load ratings for
extended periods, it is not advisable to power the inverter with the same battery used to
power your car or truck. If the car or truck battery is utilized for an extended period, it is
possible that the battery voltage may be drained to the point where the battery has
insufficient reserve power to start the vehicle.
•
It may be advisable to operate the inverter from a bank of batteries of the same type in
a parallel configuration. Two such batteries will generate twice the amp/hours of a single
battery; three batteries will generate three times the amp/hours and so on.
P A G E 7
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